Dybus, Andrzej, Anna Siemierz, Dariusz Wysocki, Iwona Szatkowska, Magdalena Muszyńska, and Sebastian Guenzel. 2010. “Evaluation of the Applicability of Polymerase Chain Reaction (PCR) to Sex Identification in Eurasian Blackbirds (Turdus Merula)”. Biological Letters 46 (1):15-20. https://doi.org/10.2478/v10120-009-0009-x.